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PF768, Standard Electrical Repairs
If that doesn't help, open the phone. Give the board power and start it up (by press-
ing the On/Off key or setting DCIO high).
Schematic of the keyboard functions is shown in fig. 7.4.
Measure the VDIG voltage (fig. 7.5, ~3.2V).
• If it's incorrect, proceed to chapter 3 ("Doesn´t start"-fault).
• If the VDIG voltage is correct, check if there's voltage (~3.2V) at the marked
sides of R630-R634 (fig. 7.5).
Fig. 7.5
* If the voltage is missing at one or more of the resistors, measure the resist-
ance from the marked side of C600 to the marked side of the resistor in ques-
tion (~0 ohms).
* If the resistance is too high there's a foil damage and the phone is to be
discarded.
4/00021-2/FEA 209 544/11.C
Fig. 7.4
39
(68)
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